Wu Lingyu

"' This smile is too fake, I’d rather you not smile.' 

He touched his chin and said 'Others have always said that my smile is like the sun and it brings them warmth and hope, and they can feel the glory…'

 'Those people were blind.' She cut him off midway and shot him a superficial glance.

 'Haha…' Wu Lingyu let out a laugh and no longer kept up the pretense and his whole aura changed.

''His smile turned from one of brilliant sunshine into one that was from the dark abyss. His whole expression took an instant switch as his whole demeanour changed and his eyes that were innocent and pure changed to one that had a tinge of demonic charm and his whole persona seemed to have changed into a completely different person.''" - chapter 43

Appearance
"He had a sharp face that was extremely handsome, a rather straight nose and sexy lips. His eyes were closed, so there was no way of knowing whether they were good looking or not. However, his long eyelashes were definitely extremely attractive." - chapter 36

Before Soul Fusion
" 'What does your incomplete soul have to do with anything?' Sima You Yue didn’t get it.

 'That undying old man’s master plan… It’s because my soul is incomplete that I would be the perfect host.' Wu Lingyu said light heartedly.  'Host?' Sima You Yue sat upright, 'Could it be like my situation?'

 'Should be around the same thing.'

She looked at him twice over, thinking about how an undying old man’s soul might inhabit in the future, and almost broke out in cold sweat.

'' 'So when it comes down to it, I should get you to form a contract with Mo Sha right now. You should fuse together quickly so that the old thing would have no way to move against you.' Sima You Yue said, 'Anyway, Mo Sha has not made an appearance in such a long time. I wonder what he’s doing inside the bracelet.'''

 'He could be preparing for the fusion.' Wu Lingyu guessed.

'' 'I don’t know, let me try contacting him. He actually blocked our contract so I have no way of contacting him now.' Sima You Yue said with curiosity, 'Since I can’t reach him, we have no way to establish your contract.'''

'' 'No rush, that old thing still has a few years worth of time.' Wu Lingyu said, 'He’s been in closed door cultivation recently, who knows when he will be able to advance in rank successfully. That will buy him quite a bit of time. Living in one’s own body should be much better than finding a new one. I’m merely his plan B. Of course, in order to ensure that I’m the best plan B ever, he has been using quite a few resources on me.'''" - chapter 505

After Soul Fusion
After Wu Lingyu's and Mo Sha's souls are fused together, some things in his body changed (chapter 893). Both souls' little realms are merged together. Memories and skills are merged. Wu Lingyu's light attributes are carried from the body. Mo Sha's dark attributes are carried from the soul, hence he can use Black Fire. But unlike Sima You Yue's Divine Devil Physique, he does not need to worry about his body exploding.

Excerpt of Shao Yun Xiao's confrontation:
" 'I have nurtured you for so many years and this is how you repay me?' Shao Yun Xiao was incensed.

'' 'Nurtured me? You nurtured me for so many years, wasn’t it just because you wanted to prepare a body for yourself?' Wu Lingyu said, 'The stronger I became, the stronger you would eventually be. That you really just wanted to nurture me, which was why you gave me so many resources and treated me well… do you believe your own words?'''

 'What rubbish are you spouting!' Shao Yun Xiao sneered, 'Of course it was for you that I did so much.'

'' 'Is that so?' Wu Lingyu sneered, 'Then why did you feed me those pills? The last time you used the excuse of examining my body to attack my soul, what was that about? If I really ate the pills that you had been feeding me, I would really have been done for then, right?'''

''Sima You Yue was shocked. Shao Yun Xiao had already acted against him like that?''

'' 'You knew it all?!' This time, it was Shao Yun Xiao’s turn to be surprised. He had always thought that he had kept it a secret and that nobody should know about it.''

'' 'You’ve almost reached your limit with no way of breaking through. That was why you wanted to find someone to nurture, so that you could use them as a backup. When you heard that my soul was incomplete, you felt that your opportunity had come. That was why you personally came to get me from the Divine Devil Valley. You gave me all the best resources all these years and got me to increase my strength nonstop. You did all those things because you wanted to increase your strength, right?' It was rare for Wu Lingyu to say so much.''" - chapter 1028

Skills and Abilities

 * Wu Lingyu’s proficiency in barriers is extremely powerful.
 * His alchemy skill is better than Sima You Yue's.
 * His skills in alchemy, taming spirit beasts, creating arrays, and refining tools are seen throughout the novel. It is unknown if he knows spirit seeking.

Illusion Ring (male ring)

 * It allows him to change his appearance and aura.
 * Sima You Yue has a matching ring.

Little World / Little Realm

 * The little world was rather similar to Sima You Yue's Spirit Pagoda.
 * Wu Lingyu refined the little world. It was only by refining the entire little world that he could gain control over it.
 * It has an endless mountain range with flora and fauna, and a thick spiritual qi in the air.

Trivia

 * Mo Sha's dark attribute is stronger than Wu Lingyu's light attribute.
 * Wu Lingyu likes to drink tea.
 * The alchemy competition in the Soul Realm is the first time that he participated as a competitor, usually Sima You Yue is the participant and he is in the stands (chapter 2095).
 * Out of all of Sima You Yue's spirit beasts, Wu Lingyu has the closest relationship to Little Seven/Xiao Qi.
 * He witnessed Sima You Yue's first "death" in chapter 1733.
 * Wu Lingyu cried in chapter 2151 when Sima You Yue's soul nearly dissipated.
 * He cried when he saw the twins (chapter 2309).
 * He cried several times when he sees the cold body of his second daughter (chapter 2306).
 * After the twins were born, they did not like their father very much. They would fall asleep after seeing Sima You Yue's images every day and ignore him (chapter 2231). They ignored him again after he woke up from his injuries (chapter 2236).
 * He formally announced to the world his real identity as a devil king (chapter 2237).